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105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "EyesWidget.h"
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#include <AK/Math.h>
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#include <LibGUI/Painter.h>
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#include <LibGUI/Window.h>
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#include <LibGfx/Palette.h>
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void EyesWidget::track_mouse_move(Gfx::IntPoint point)
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{
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m_mouse_position = point - window()->position();
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update();
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}
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void EyesWidget::paint_event(GUI::PaintEvent& event)
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{
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GUI::Painter painter(*this);
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Gfx::AntiAliasingPainter aa_painter { painter };
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painter.clear_rect(event.rect(), Gfx::Color());
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for (int i = 0; i < m_full_rows; i++) {
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for (int j = 0; j < m_eyes_in_row; j++)
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render_eyeball(i, j, aa_painter);
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}
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for (int i = 0; i < m_extra_columns; ++i)
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render_eyeball(m_full_rows, i, aa_painter);
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}
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void EyesWidget::render_eyeball(int row, int column, Gfx::AntiAliasingPainter& painter) const
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{
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auto eye_width = width() / m_eyes_in_row;
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auto eye_height = height() / m_num_rows;
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Gfx::IntRect bounds { column * eye_width, row * eye_height, eye_width, eye_height };
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auto width_thickness = max(int(eye_width / 5.5), 1);
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auto height_thickness = max(int(eye_height / 5.5), 1);
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bounds.shrink(int(eye_width / 12.5), 0);
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painter.fill_ellipse(bounds, palette().base_text());
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bounds.shrink(width_thickness, height_thickness);
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painter.fill_ellipse(bounds, palette().base());
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Gfx::IntPoint pupil_center = this->pupil_center(bounds);
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Gfx::IntSize pupil_size {
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bounds.width() / 5,
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bounds.height() / 5
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};
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Gfx::IntRect pupil {
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pupil_center.x() - pupil_size.width() / 2,
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pupil_center.y() - pupil_size.height() / 2,
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pupil_size.width(),
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pupil_size.height()
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};
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painter.fill_ellipse(pupil, palette().base_text());
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}
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Gfx::IntPoint EyesWidget::pupil_center(Gfx::IntRect& eyeball_bounds) const
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{
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auto mouse_vector = m_mouse_position - eyeball_bounds.center();
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double dx = mouse_vector.x();
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double dy = mouse_vector.y();
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double mouse_distance = AK::hypot(dx, dy);
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if (mouse_distance == 0.0)
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return eyeball_bounds.center();
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double width_squared = eyeball_bounds.width() * eyeball_bounds.width();
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double height_squared = eyeball_bounds.height() * eyeball_bounds.height();
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double max_distance_along_this_direction;
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// clang-format off
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if (dx != 0 && AK::abs(dx) >= AK::abs(dy)) {
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double slope = dy / dx;
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double slope_squared = slope * slope;
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max_distance_along_this_direction = 0.25 * AK::sqrt(
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(slope_squared + 1) /
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(1 / width_squared + slope_squared / height_squared)
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);
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} else if (dy != 0 && AK::abs(dy) >= AK::abs(dx)) {
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double slope = dx / dy;
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double slope_squared = slope * slope;
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max_distance_along_this_direction = 0.25 * AK::sqrt(
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(slope_squared + 1) /
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(slope_squared / width_squared + 1 / height_squared)
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);
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} else {
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VERIFY_NOT_REACHED();
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}
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// clang-format on
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double scale = min(1.0, max_distance_along_this_direction / mouse_distance);
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return {
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eyeball_bounds.center().x() + int(dx * scale),
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eyeball_bounds.center().y() + int(dy * scale)
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};
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}
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